Knife-polishing machine.



No. 812,489. PATENTED FEB. 13, 1906. F. FRIBG.

KNIFE POLISHING MACHINE.

APPLICATION TILED JAN. 4, 1905.

As'mzilizz 71 FRANZ FRIEG, or LUDWIGSBURG, GERMANY.

KNIFE-POLISHING MACHINE.

Specification of Letters Patent.

Patented Feb. 13, 1906.

Application filed January 4, 1906. Serial No- 239,668.

To aZZ whom it may concern.-

Be it known that I, FRANZ Fnrne, a subject of the German Emperor, and aresident of Ludwigsburg, Germany, have invented certain new and usefulImprovements in Knife-Polishing Machines, of which the following is aspecification.

The subject of this invention is a knife-polishing machine in which thetwo axles of the rollers are held by oscillating bearing-arms drawntoward each other by springs, while the knife-holding device isstationary. By this arrangement the rollers can be moved sidewise withthe greatest ease, and they always adjust themselves automatically onthe knife.

The subject of the invention is illustrated in the accompanyingdrawings, in which- Figure 1 shows a top view. Fig. 2 shows a verticalsection on lines A A. Fig. 3 shows a vertical section.

Similar figures refer to similar parts throughout the several views.

The axles 1 of the polishing-rollers 2 are j ournaled in the arms 3,which turn on the pivots 5 on the frame 4 and are drawn toward eachother by spiral springs 6 in a manner that the rollers exert an elasticpressure on each other. In order to be able to regulate this pressure,the spring can be adjusted at one end or point of suspension by means ofa thumb-nut 7. The polishingrollers are actuated by a pair of conicalwheels 8 9, of which the wheels 9 on the common driving-axle 10 of themachine can be shifted, which is effected by the ends of the axles 1engaging with grooves 11 of the wheels 9. In order to make these wheels9 turn with the axle 10, a wedge 12 is affixed to the same, whichengages a corresponding groove of the axle 10. The axle 10 is journaledin the bearings 13 on the frame 4.

The knife is held below on rollers 14, which can be raised and lowered,and is kept in a vertical position between the guiding-plates 15 whichare lined with elastic coverings and laterally adjustable.

In the front parts of the side walls of the casing 4. are provided slits16 for the laterallyshiftable axles 1. The machine is, moreover,provided in the usual manner with a disk 17 for polishing forks and withholes 18 for introducing the polishing material into the cas- It isevident at once that the oscillatinglyj ournaled polishing rollers canbe moved sidewise uncommonly easily and that they adjust themselves withtheir contact-surface on the knife automatically, whereby a cutting ofthe knives into the rollers is safely prevented. As a result thecostlyrollers will last much longer.

What I claim as my invention, and desire to secure by United StatesLetters Patent,

1. In a knife-polishing machine the combination of two swinging framesfor two polishing-rollers, an adjustable spring acting to automaticallydraw together one roller toward the other and movably-arranged motiontransferring gear-wheels, substantially as and for the purposespecified.

2. In a knife-polishing machine the combination of two swinging framesfor two polishing -rollers, an adjustable spring acting to automaticallydraw together one roller toward the other, a driving-shaft, longitudinalgrooves on said driving-shaft, shiftable motion-transferring gear-wheelsthe longitudinal movements of which are guided in said grooves, collarsfastly connected to said gear-wheels and provided with grooves runningaround said collars, in which grooves the free ends of the roller-shaftscarrying the cooperating gear-wheels are guided, substantially as andfor the purpose set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

FRANZ FRIEG.

Witnesses WM. HAHN, M. Brsonor.

